基于IDA的型钢混凝土框架的地震易损性分析
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摘要
基于增量动力分析(IDA)方法研究了型钢混凝土框架结构在地震作用下的易损性和抗倒塌能力。设计了4个具有不同柱梁抗弯承载力之比的结构,对其进行IDA分析,获得了各模型的抗震能力曲线。进行了场地地震危险性分析,获得了场地地震危险性概率模型。根据结构抗震能力曲线,分析了结构的地震易损性,得到了结构在地震作用下各性态点的超越概率及结构抗倒塌储备系数。根据结构地震易损性曲线和场地地震危险性概率模型,计算了结构各性态点的年平均超越概率。结果表明,柱梁抗弯承载力之比对计算结果有显著影响,柱梁抗弯承载力之比越大则结构的抗倒塌储备系数越大,结构在特定地震动作用下倒塌的概率越小。
The seismic fragility and collapse capacity of SRC structures were investigated based on incremental dynamic analysis(IDA) method.Four structures with different ratios of column-to-beam strength were designed and calculated to obtain the structural seismic capacity curves.The probability models for ground seismic hazard are established through ground seismic hazard analysis.The structural seismic fragility was analyzed according to the calculated structural seismic capacity curves,and the exceeding probability of different state levels,as well as collapse margin ratio(CMR) were obtained.Based on the calculated fragility curves and probability models for ground seismic hazard,the annual exceeding probability of different states is derived.The results show that the ratio of column-to-beam strength has great influence on structural seismic fragility.For a certain earthquake,CMR is increased as ratio of column-to-beam increases,i.e.,an increase in the ratio of column-to-beam strength can effectively reduce the collapse possibility of the structure.
The seismic fragility and collapse capacity of SRC structures were investigated based on incremental dynamic analysis(IDA) method.Four structures with different ratios of column-to-beam strength were designed and calculated to obtain the structural seismic capacity curves.The probability models for ground seismic hazard are established through ground seismic hazard analysis.The structural seismic fragility was analyzed according to the calculated structural seismic capacity curves,and the exceeding probability of different state levels,as well as collapse margin ratio(CMR) were obtained.Based on the calculated fragility curves and probability models for ground seismic hazard,the annual exceeding probability of different states is derived.The results show that the ratio of column-to-beam strength has great influence on structural seismic fragility.For a certain earthquake,CMR is increased as ratio of column-to-beam increases,i.e.,an increase in the ratio of column-to-beam strength can effectively reduce the collapse possibility of the structure.
引文
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[11]朱雁茹,郭子雄.基于OpenSEES的SRC柱低周往复加载数值模拟[J].广西大学学报:自然科学版,2010,35(4):555-559.
[2]VAMVATISIKOS D,CORNELL C A.Applied incremental dynamic analysis[J].Earthquake Spectra,2004,20(2):523-533.
[3]VAMVATISIKOS D,CORNELL C A.Direct estimation of seismic demand and capacity of multi-degree of freedom systemsthrough incremental dynamic analysis of single degree of freedom approximation[J].Journal of Structural Engineering,2005,131(4):589-599.
[4]韩建平,吕西林,李慧.基于性能的地震工程研究的新进展及对结构非线性分析的要求[J].地震工程与工程振动,2007,27(4):15-23.
[5]马千里,叶列平,陆新征,等.采用逐步增量弹塑性时程方法对RC框架结构推覆分析侧力模式的研究[J].建筑结构学报,2008,29(2):132-140.
[6]施炜,叶列平,陆新征,等.不同抗震设防RC框架结构抗倒塌能力的研究[J].工程力学,2011,28(3):41-48.
[7]李谦.增量动力分析方法的研究及其应用[D].西安建筑科技大学土木工程学院,2011.
[8]黄明刚.钢筋混凝土连续桥的地震易损性、危险性及风险分析[D].哈尔滨:哈尔滨工业大学土木工程学院,2009.
[9]VAMVATSIKOS D,CORNELL C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491-514.
[10]吕大刚,王光远.基于可靠度和性能的结构整体地震易损性分析[J].自然灾害学报,2006,15(2):157-162.
[11]朱雁茹,郭子雄.基于OpenSEES的SRC柱低周往复加载数值模拟[J].广西大学学报:自然科学版,2010,35(4):555-559.
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